People who stammer can be quite annoying when they are trying to tell you something. Even though you have got ther gist of what they are trying to say, they still have to try and complete the sentence.
I have never had the fortune to see a truly blind person walk into anything.
People who stammer annoy me, you end up ending their sentences for them. Blind people on the other hand are hilarious when they walk into things and fall down holes etc!